<?php

use WebPageTest\Util;

$gtm_id = Util::getSetting('gtm_id');
?>

<?php if ($gtm_id) : ?>
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','<?= $gtm_id ?>');</script>
<?php endif; ?>
